/*
 *  Copyright 2014 Alexey Andreev.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.teavm.common;

import java.util.Arrays;

public class IntegerStack {
    private int[] buffer;
    private int head;

    public IntegerStack(int capacity) {
        this.buffer = new int[capacity];
    }

    public void push(int value) {
        if (head == buffer.length) {
            buffer = Arrays.copyOf(buffer, Math.max(buffer.length * 2, 1));
        }
        buffer[head++] = value;
    }

    public int pop() {
        return buffer[--head];
    }

    public int peek() {
        return buffer[head - 1];
    }

    public boolean isEmpty() {
        return head == 0;
    }
}
